This new internal pipe cleaner launched in 2015, is a pH neutral liquid formula. It is designed to loosen and flush out biofilm from hot tub piping. Originally used for the Moss program developed some years ago, MicroCleanse on its own is a very powerful pipe cleaner. This is a one time use bottle for one draining sequence. It’s important to wash and rinse the hot tub interior well after draining, and to rinse the Microfilter several times after a refill to capture any remaining biofilm. MicroCleanse has no sanitizing capability – but it makes water uninhabitable for biofilm and bacteria as it soaks to do its job for 24 hours.